package com.util;

import java.sql.Connection;
import java.sql.DriverManager;

/**
 * Created by Wuxiang on 2018/4/11
 */
public class DBHelper {

    private static final String driver = "com.mysql.jdbc.Driver"; //数据库驱动
    //连接数据库的URL地址
    private static final String url = "jdbc:mysql://localhost:3306/yxrswx?useUnicode=true&characterEncoding=UTF-8";
    private static final String username = "root";//数据库的用户名
    private static final String password = "960629";//数据库的密码

    private static Connection conn = null;

    //静态代码块负责加载驱动
    static {
        try {
            Class.forName(driver);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    //单例模式返回数据库连接对象
    public static Connection getConnection() throws Exception {
        if (conn == null) {
            conn = DriverManager.getConnection(url, username, password);
            return conn;
        }
        return conn;
    }

    public static void main(String[] args) {

        try {
            Connection conn = DBHelper.getConnection();
            if (conn != null) {
                System.out.println("数据库连接正常！");
            } else {
                System.out.println("数据库连接异常！");
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }

    }
}
